package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.date.DateTime;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexPatterns;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.lang.reflect.Field;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.USER_SIGN_KEY;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }

        //如果符合，生成验证码
        String code = RandomUtil.randomNumbers(6);

        //保存验证码到redis
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY +phone,code,RedisConstants.LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //发送验证码
        //省略
        log.debug("发送验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        //从redis获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY +phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)){
            //不一致，报错
            return Result.fail("验证码错误");
        }


        //判断用户是否存在
        User user = query().eq("phone", phone).one();
        if (user == null) {
            //不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        // 保存用户信息到redis
        // 1.随机生成token
        String token = UUID.randomUUID().toString(true);

        // 2.将User对象转化为Hash存储

        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
//        Map<String, Object> userMap = new HashMap<>();
//        userMap.put("userId",userDTO.getId());
//        userMap.put("nickName", userDTO.getNickName());
//        userMap.put("icon", userDTO.getIcon());

        // 3.存储
        stringRedisTemplate.opsForHash().putAll(RedisConstants.LOGIN_USER_KEY+token,userMap);
        //设置有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY+token,RedisConstants.LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId +format;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth-1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId +format;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();

        //获取本月截止到今天的签到记录
        //获取签到记录，按位与运算，移位操作
        List<Long> result = stringRedisTemplate.opsForValue().
                bitField(key,
                        BitFieldSubCommands.create().
                                get(
                                        BitFieldSubCommands.BitFieldType
                                        .unsigned(dayOfMonth))
                                .valueAt(0));
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }

        Long num = result.get(0);
        if (num == null ||num == 0){
            return Result.ok(0);
        }
        int count = 0;
        while (true){
            if((num & 1) == 0){
                break;
            }else{
                count++;
            }
            num >>>=1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));

        save(user);
        return user;
    }
}
